Carbureter.



E. GOBB'I.

GARBURBTER. v

APPLICATION FILED JULY 24, 1911. v 1,061,835. Pa1e111ed111ay13,1913.

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EMILIO GoBEI, or ASNIERES, FRANCE.

CAEBUEETEE.

specification of 'Letters Patent.

Patented May 13, 1913.

Application. led July 24, 1911. Serial 110.640,298.

T0 au whom t may concern Be it-known that I, EMILI GOBBI, a sub.

ject of the King of Italy, residing at Asnires, Seine, JFranCe, haveinvented certain new and. useful Improvements in Carbureters, of whichthe following is a speciiication.

This invention relates to improvementsin carbureters, and its primaryobject, namely, to provide an extremely sensitive and responsivearrangement which will correctly proportion the mixture with the enginerun-` ning both at high and low speed, is served by a number of novelfeatures of construction.

According to the invention, the bore of the nozzle, which in sprayIcarbureters, is used for conducting liquid hydro-carbon to the sprayingorifice, communicates Awith van aperture provided in the wall of thenozzle and arranged below the level of the liquid in the constant levelchamber, whereby, during the normal running of the engine, a-`

draft of air is induced into the nozzle, lthe intensity of which isproportionate toj the suction exerted, and which is efectiveto insurethe proper proportioning of the hydro-carbon constituent of theexplosive mixture.

A further feature of the invention is the provision of a throttlingdevice that may be closed directly against the nozzle and to completelycut off the motor suction tube and the main air supply inlet, thisthrottling device having a small orifice which, when the device is inclosed position, communicates with the nozzle and havin an'auxiliary airinlet passage. Ordinarily, with a throttle of the usual construction, inclosed position there is always a communication between t-he main airinlet and the motor suction tube-and between the latter and the nozzle;in other words, there is never a complete cut off. The objection to thisarrange.

ment is that when the engine is running at excessively low speed and thethrottle is closed, it is impossible to secure a proper proportion ofthe air and hydro-carbon constituents of the explosive mixture, andthere will be an excess of air. This object-ion is eliminated by thethrottling device of the present invention, by means of which acomparatively strong suction action is transmitted to the nozzle bywhich the hydrocarbon is conducted, and at the same time a suitable andnot excessive supply of air is induced. When the novel throttling deviceis used with multiple-nozzle carbureters, it is lto be closed at leastagainst one of the nozzles. A The invention will be understood from theaccompanying drawings, wherein:

Figure 1 is a longitudinal section on the constructed in accordance withthis invention; Fig. 2 is a cross-section on the line 2-2 Of Fi 1; Fig.3 is an axial section of a mod' ed form of nozzle; and Figi 4 is asimilarview of a further modication.

Referring to Fig. l, the nozzle 1, which is provided lwith a sprayingorifice 2, is disposed within a substantially tubular casing 3 having anair inlet 4. This casing is also provided with a collar 5 which isconnected to the suction pipe 6 of the engine, and with ,a throttlingdevice?. At one side of the casing, there is disposed a constant-levelfuel tank 8 equipped with a float 9 and with an 4externally-threadednipple 10 which serves to connect the tank and the supply pipe 11 forthe liquid hydro-carbon. Said tank is also furnished with a needle valvel2 and communicates with the nozzle 1 by way of a conduit 13, the valvejust referred to being carried by the iioat.

The nozzle ,l is -apertured for the purpose of inducing adraft of airtherethrough when the hydro-carbon is drawn through the orifice 2 withsuicient speed. In Fig. 1,such apertures are shown at 14 and openupwardly and inwardly intoV thebore of the nozzle; but in place of thesaid apertures the nozzle may be provided with a series of spacedconical iianges 14', (Fig. 3), which form av multiple injector, or witha foraminous section 142, (Fig. 4).

`By adopting the arrangement described, a mixture will be obtainedduring the suction of the engine, (except when the engine works at anexcessively slow speed and the suction force is correspondingly low,)which will serve to eifectively regulate the quantity of hydro-carbondrawn in at each suction stroke of the engine. A lossv of thehydro-carbon occurs when the engine is standing still, (obviously noloss takes place when the engine is working, because the hydro-carbon,instead of escaping through line l-1 of 2, of one form of carbureternormal level of the hydrocarbon in tank 8,

bears directly against said nozzle.

the tube being preferably provided with a tapered lining 16 whosegreatest thickness is at its lower end. In conjunction with said tubethere is provided a conical ange 17 which is located at the top of thenozzle and is designed to concentrate and direct into the tube afairlyvlargeE portion of the air that, during the suction stroke of theengine, is drawn through the air inlet 4,

4such portion being, of course, dependent on the dimensions of thefiange, as well as on the velocity of lthe air entering said inlet.Under" these conditions, there will be obtained, on the stoppage of theengine, a reserve of hydro-carbon in the said tube. At the first suctionstrokes'of the engine, the hydrocarbon thus placed in reserve will bedrawn through the hole or holes 14, and during the normal working of theengine the desired suction of air for producing the explosive mixturewill be effected.

The throt-tling device 7 is in the form of a plate, and is arranged inthe casing 3, above the nozzle l, its arrangement b eing of such naturethat in its closed position it The throttling device is provided with anupwardly widened orifice 18 which alines with -the spraying orifice -2,and communicateswith an air conduit 19, which, in turn, opens and inwhich a regulating valve 20 may be fitted. When the throttling plate 7is in its closed position it completely cuts off the motor suction tube6 and the main air inlet 4. Its orifice 18 alines with the sprayingorifice 2, so that a strong suction action is transmitted to the latter,and an adequate supply of liquid hydro-carbon is secured when the engineis running at low speed. At the same time, a proportionate amount of airis drawn in through the passage 19. Thus, for a given range of lowspeed, a proper mixture of air and hydro-carbon is obtained.

As shown in Figs. 1 and 2, the throttling plate is in the form of a diskhaving a diametrically arranged pin 21, the projecting` ends of whichserve as trunnions. The nozzle l is arranged eccentrically of the casing3, andthe air inlet 4 is arranged laterally of the casing 3. The plate 7is provided on its upper side with. an arcuate flange 22, the

radius of.which is taken` from the pin 21 asl a center. This flange 22is located on that side of the plate 7 which is in line with the inletl4, and will contact With the adjacent side of the casing 3 in anyposition of said plate. Consequently, the airdrawn in through the inlet4 will be prevented from `passing between the throttle and the adjacentside of the casing, but on the other hand,.will be positively directedimmediately over the nozzle so as to intimately mingle with the fluiddischarging at the orifice 2.

The nipple 10 which connects the fuel tank to the inlet conduit 11 forthe hydrocarbon, and the needle valve 12 are preferably arranged `sothat the hydro-carbon passes into the tank from the top, in which casesaid nipple is provided with a depending tubular extension 23 and thefloat 9 is provided with a corresponding tube 24,

a casing adapted for connection to the suction pipe of an engine andprovided with an air inlet; of a nozzle disposed within the casing; atube inclosing said nozzle and spaced therefrom; a conical flangeprovided yupon-the upper end of said nozzle and extending pastthe upperend of said tube, for directing air into the space between the tube andthe nozzle; and means for 'supplying fuel to the nozzle, said nozzlehaving an aperture through which the air is drawn thereinto fromv saidspace simultaneously with 'the fuel, to mix directly with the latter, bythe suction created in said casing.

2. In a carbureter, the combination with a casing adapted for connectionto the suction pipe of an engine and provided with an air inlet; of anozzle disposed within the casing and provided with a spraying orifice;means for supplying fuel to said nozzle; and a throttle located in saidcasing and comprising a pivotally-mounted disk provided with an orificeand with a conduit opening at one end into the latter and at the otherend. through the bottom face of the disk, the orifice in said diskregistering directly with the first-named orifice when the throttle isclosed.

3. In a carbureter, the combination with a casing adapted for connectionto the suction pipe of an engine and provided with an air inlet; of anozzle disposed within the cas-. ing; a tube inclosing said nozzle andspaced therefrom; a conical flange provided upon the upper end of saidnozzle and extending past the upper end of said tube for directing airintov the space between the tube and the nozzle, said nozzle havingupwardly and inmy hand in presence of two subscribing wit- Wardlydirected apertures below: the fuel nesses. level throughwhichl the airis drawn there- EMILIO GOBBI. Into from said space slmultaneously with 5the fuel, to mix-directly with the latter, by Witnesses:

the suctioncreated in said casing. H. C. COXE,

In testimony whereof I have hereunto set PAUL BLUM.

